TI - HOspital service in the united states PT - JOUR DP - 1949 TA - Journal of the American Medical Association pages = {112-113}, VI - 140 IP - 1 AID - 10.1001/jama.1949.02900360114012 [doi] 4100 - http://dx.doi.org/10.1001/jama.1949.02900360114012 SO - Journal of the American Medical Association May 7, 1949 140(1):112